The Sungrow SG350HX-US is a transformerless three-phase PV inverter that connects to the grid. Its maximum efficiency is 99.02 percent and its CEC efficiency is 98.5 percent. Its maximum AC output current is 254 A. At 40 °C, full-power MPP tracking covers 860 V to 1330 V. The AC voltage range is 704 V to 880 V. Built-in protection covers DC reverse connection, AC short circuit, leakage current, ground faults and grid monitoring. It also has Type II surge protection on the DC and AC sides. The inverter has a DC switch but no AC switch. It supports PV string current monitoring and reactive power at night. Anti-PID and PID recovery are optional and need the EMU200. It communicates over RS485 and PLC, and on site you can reach it through LED indicators or Bluetooth with an app. The inverter is listed to UL 1741 including SA and SB, UL 62109-1, CSA C22.2 No.107.1, IEEE 1547-2018, IEEE 1547.1-2020, California Rule 21 and HECO SRD V2.0. It is IP66 (NEMA 4X) rated, cooled by smart forced air, and weighs up to 123 kg.
manufactured_byc1 drafted · lead Sungrow proposed
sec=9.3 h=e0a94aac5535sec=h1 h=8407ffd9bf1freview note: support check: partial - Passages mention SUNGROW warranty and the SG350HX-US title, but never explicitly state Sungrow manufactures this model (implied only).
instance_ofPV grid-connected inverter
sec=h1 h=8407ffd9bf1ftbl=5.r2 h=e91b2dcaf5e4uses_protocolRS485 connection on COM1 per the quick installation guide
tbl=41.r6 h=481165dab06atbl=3.r22 h=22793dca4dd0sec=h15 h=73d1b48b8ca6sec=5.8.2 h=23149c859eeac4 drafted · lead Power line communication
tbl=41.r6 h=481165dab06atbl=3.r24 h=48d6b8bc20afLocal display is LEDs plus Bluetooth with an app
tbl=41.r5 h=a98ba6362a18certified_toc6 drafted · lead UL 1741 proposed
tbl=41.r9 h=a4584af8cea9c7 verified · fact UL 1741 SA proposed
tbl=41.r9 h=a4584af8cea9verified by: review-workflowverified on: 2026-10-24
c8 drafted · lead UL 1741 SB proposed
tbl=41.r9 h=a4584af8cea9c9 drafted · lead UL 62109-1 proposed
tbl=41.r9 h=a4584af8cea9c10 drafted · lead IEEE 1547-2018 proposed
tbl=41.r9 h=a4584af8cea9c11 drafted · lead IEEE 1547.1-2020 proposed
tbl=41.r9 h=a4584af8cea9c12 verified · fact CA Rule 21 proposed
tbl=41.r9 h=a4584af8cea9verified by: review-workflowverified on: 2026-10-24
c13 drafted · lead HECO SRD V2.0 proposed
tbl=41.r9 h=a4584af8cea9implementsc14 drafted · lead Reverse polarity protection
DC reverse connection protection
tbl=40.r6 h=8ae902b4e8e0tbl=40 h=b57a1a527249c15 verified · fact Residual current monitoring
Listed as leakage current protection
tbl=40.r8 h=c02c44861dc8tbl=40 h=b57a1a527249verified by: review-workflowverified on: 2026-10-24
c16 drafted · lead DC ground-fault protection
Listed as ground fault monitoring
tbl=40 h=b57a1a527249c17 verified · fact String monitoring
tbl=40.r12 h=dc748d0b3056tbl=40 h=b57a1a527249verified by: review-workflowverified on: 2026-10-24
c18 drafted · lead Reactive power at night
tbl=40.r13 h=8c7a1b750c37tbl=40 h=b57a1a527249c19 drafted · lead Surge protection
Type II on both DC and AC sides
tbl=40.r15 h=30f0353a71c9tbl=40 h=b57a1a527249c20 verified · fact PID recovery
Optional, provided with the EMU200 accessory
tbl=40 h=b57a1a527249verified by: review-workflowverified on: 2026-10-24
requiresc21 drafted · lead Sungrow EMU200 proposed
Needed only for the optional anti-PID and PID recovery function
tbl=40 h=b57a1a527249review note: support check: partial - EMU200 is tied to the optional anti-PID function, but 'requires' is only implied as optional and not stated as a requirement.
efficiencyc22 drafted · lead nominal 99.02 PERCENT
Conditions: Maximum efficiency
tbl=40.r4 h=9d41de21bb96tbl=40 h=b57a1a527249review note: possible conflict with c23 (same source; check the conditions)
c23 drafted · lead nominal 98.5 PERCENT
Conditions: CEC weighted efficiency
tbl=40.r4 h=9d41de21bb96tbl=40 h=b57a1a527249review note: possible conflict with c22 (same source; check the conditions)
mppt_voltage_rangeConditions: Full power MPP voltage range at 40 °C
tbl=39.r6 h=cfc7f2773243rated_output_currentc25 drafted · lead nominal 254 A
Conditions: Maximum AC output current
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